d = {'a': 1, 'b': 2, 'c': 3};
print(d.values());
#默认 迭代Key
for k in d:
	print(k);

#迭代value
for v in d.values():
	print(v);
	
#同时迭代Key=>value
for k,v in d.items():
	print(k,'=>',v);	

#同迭代list或tuple的索引和值
t=(10,20,30,40);
for k,v in enumerate(t):
		print(k,'=>',v);	